FFS VITOR, ACCOUNTS EXIST IN A REGISTER BY DEFINITION, WHAT IS THE REGISTER, WHERE DOES IT EXIST, WHO OWNS IT? Non of this makes sense in the context of Nostr. And yes, we most certainly can have accounts with relays on Nostr, thats exactly what piramid does

Yes, but your account in a pyramid relay is your nsec. There is no other account with them. So, your nsec is the account.

Far too many people have misunderstood Nostr as something philosophically different than other systems. There are many technical differences between nostr and other social media networks.. but an account is still an account.